Crib block for retaining walls



FIG. 1 is a perspective view of a crib block for retaining walls embodying my new design;

FIG. 2 is a front elevation thereof;

FIG. 3 is a right side elevation thereof; and

FIG. 4 is a top plan view thereof.

The rear elevation, left side elevation and bottom plan view are identical to the front elevation, right side elevation and top plan respectively. 

The ornamental design for a crib block for retaining walls, as shown and described. 